At a Internet Cafe?  Accessing your email using Office 365’s Outlook Web Access?  You can chat directly from Outlook Web Access, with your Lync contacts.

Prerequisites: The contact you want to Instant message has to be either a Lync user with open federation enabled, or a Windows Live Messenger user.

How to:

  1.  Log into https://login.microsoftonline.com
  2. Select Outlook
  3. To open your Lync contacts, select the Address Book link in the top right hand corner.
  4. To chat with your internal contacts, select the Default Global Address List.
  5. To chat with your external contacts, select Contacts.
  6. Select the contact from the middle pane.  As long as they have an IM address entered into their contact record, you can chat with them.
  7. In the right details pane, select Chat.  A separate window will open to send instant messages.